A description is presented of the building system program developed by the Metropolitan Toronto School Board, Study of Educational Facilities. The organization of the project is discussed, and the rationale is presented for the selection of an open systems approach to the School Board's building needs. Detailed information is given regarding the SEF Building System's 10 sub-systems and to principal non-system items; a sub-system is an identifiable, complete, designed, physically integrated, dimensionally co-ordinated, installed series of parts, which function as a unit without prescribed performance limits. Specific requirements are presented regarding an overall time program for the project, program budget, bidding procedures, and quality control procedures. Consideration is also given to codes and standards, bids and bid evaluation, and individual project construction. (FS)